Pulverized-fuel burner for furnaces.



PATENTED MAR. 20, 1906. l

I c. A. MATGHAM. PULVBRIZED FUEL BURNER PoR PURNAGES.

a SHEETsfsHBET 1.

APPLICATION FILED 16.113.19.05-

2' :i n 4 4 /J i Y No. 815,929. PATENTED MAR. 20, 1906.

C. A. MATCHAM. PU'LVERIZED FUEL BURNER FOR FURNAGES.

APPLICATION P ILBD MAY 3.v 1905.

3 SHEETS-SHEET 2.

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No. 815,929. PATENTED MAR. 20, 1906.

9 c. A. 'MATGHAM l PULVERIZED FUEL BURNER- FoR FURNAGES,

AAPPL'IoATIoN I ILED una, 1905.

3 SHEETS-SHEET 3.

UNITED sTA'rnsI "PATENT yo innon. I

CHARLES A. `MAroHAM, oF, ALLENTOWN, PENNSYLVANIA.

l PuLvEmz'ED-FUEL BunNEi-'c FOR FuRNAcEs.

I Specification of LettersPatent. Application filed Hay 3,1905. SerialNo.' 258,683.

,Patented mmh ao, 190e.

To a/ZZ whom, it may concern:

Be it known vthat I', CHARLES A. MAToHAM, a citizen of the UnitedStates, residing in Allentown, Pennsylvania, have invented certain Imrovements in Pulverized-Fuel Burners for urnaces, of which the followingis a specification.

The object of my invention is to so conf l struct apulverized-fuel'burner for furnaces that the complete combustion of thefuel in 7 the furnace can be effected without the necesject I attain inthe manner hereinafter setin drawings, in Wh1chsity of employing-blast-fans or other apparatus for sup lying air under pressure with thepowdere fuel, the natural 'draft of the furnace being relied u` ontoeffect inflow of' v air in such volume an in such relation to theinflowing stream of powdered fuel as to insure the'combustion of thelatter. This 0bforth, reference being had to the acco'mpanyj igurel '.1is a vertical sectional view of a I pulverized-fuel burner constructedin accordance with my invention.

Fig. 2 is a sectional plan view of the same. Fig. S'is a front view ofthe burr-ieri Fi 4 is a vertical sectional view of a modified orm ofburner embodying Fig. 5 is a certain features of m invention.ltransverse section o the same. lFig. 6' is a vertical sectional view ofstill another form of burner embodyingmy invention. Fig. 7 is atransverse sectional view.y of the same; and .F1g. 8 1s an end vlew,partly 1n sectlon, of

said. burner. 'Referring first'to Figs. 1; 2,'and '3 of the drawings, 1represents the neck ofthe burner,` f which is suitably mounted in thefront wall of a furnace, in the fixed end Wall ofthesupporting-structure of a rotating kiln, or in proper relation to anyother structure which vis to be heated bythe combustion of the powderedfuel.

f The neck 1 .has a central passage 2 for the iniiow of the powderedfuel and on each side of the same anair-passage, said neck also having acentral nozzle 4, through which the powdered fuel is fed. This nozzle 4preferably terminatesin the neck, so thatl the fuel said structure isdivi ed into a fuel-feed hopzle.

f per 10, a chamber 11 for supplying-air for.

projecting the powdered fue into the -furnace, an .a chamber 12 forsupplying a vol'- ume of air below the stream of pulverized fuel, saidlower volume of air, in conjunction with the volumes of air suppliedthrough the side passages 3 and with the air which is j serving tosupply all parts of said .stream with'the oxygen necessary -to supportcombustion of the fuel, the flow being induced by ,drawn in withthestreaml of powdered fuel,

the natural draft of thefurnace and being of a entler and easiercharacter than that pro-v vi ed b the usual airblast apparatus ,therebyresu ting in a better diffusion of the heat and a substantially equableheating o f the furnace, rather than an eXtreme heating-of one partofthe same at theexpense ofothe'r portions. The side passages, it willbe noted, flank the fuel-nozzle and are4 arranged to dischar e theircontentsinto the lire in close pro mity to the discharge of saidfuel-noz;

The supply of powderedfuel to the ho' per 10 is reg -area of the openingfor the issuancel of the projecting air-j et from the chamber 1 1 can beregulated by adjustment of avalve or damper 14 in said chamber, a valve'15 in the chamber b2 serving t0` regulate .the area of passage throughthe same, so that the volume of air beneath the stream of pulverizedfuel can be likewisev governed. In likemanner the flow of airthrough'the side passages 3 caribe regul ally-slidingl dampers16,"suitably guided on the. plate 5. Hence the regulation of the airsup.ly can be closely governedto accord wit the amount of fuel which isbeing fed to the furnace and withk the character ofthe combustion `whichit'is desired to maintain ated'by the adjustment of later-- ated by afeed-screw' 13, an the therein. Owin" hdwever, to the contracted area ofthe'out et from the chamber 11, asl

compared with' that from the chamber12,

IUC

the. current of air from said chamberll is usually of a more forciblecharacter than that from the chamber 12.

` All of the currents of airto which the fuel l is subjected travel inthe same direction, and hence-have no tendency to' force the volumeInrigs. 4 and 5 I musea@ a modificationof flame toward the axial center'of the fur- IIC ao a rotating drum 20, with radial blades 21,

carried by transverse staves 22, which'constitute the eriphery of thedrum, the powdered fuel eing supplied to the interior pf the drumthrough a hollow hub 23 and hopa per 24, and air being also supplied tothe interior of the drum through an open end of the same and throughopenings 25 -in the casing" in which the drum rotates, the area of saidopenings being regulated by a damper-plate ao 26, which is mounted uponthe drum-casing, so as to be partially rotatable thereon, as shown inFig. 8. This projecting apparatus is used in combination with a neck 1of the same character as that shown in Fig. 4, said ya5 neck having thecentral nozzle 4,`side passages 3, top passages 18, and bottom passageIt will benoted that the powdered fuel,- however, introduced into thenozzle 4 is free 3o to eX and as soon as it leaves said nozzle, and thuscomes directly under the influence of the currents of air from thepassages 3, 12, and 18, and a further expansion is .permitted when thefuel leaves the neck 1, so7 that the volume of flame produced by thecombustion of the fuel has a tendency to fill the furnace at once and isnot carried forward in a con' y tracted`body, as it is when the fuel isforcibly projected from a nozzle in which it has been J aterallyconfined for sometime before it esca es. x

aving thus 'described my invention, I claim. and desire t`o securebyLetters Patenty, 1,'The combination, in a ulverized-fuel burner forfurnaces, of a fue -supply nozzle arranged to discharge the pulverizedfuel into the furnace at or over the furnace Wall through which the fuelasses to the furnace, said nozzle having fuelp sages, and having itswalls vertically and laterally remote from the boundaries of thefuelvsup ly mouth,- whereby said walls exercise' no irect confining orcontracting influence andA air supply pas- -and air-passages fiankingsaid nozzle and discharging air-currents into the furnace incloseproximity to the discharge of the fuelnozzle so that the currentsof air from the said passages meet the fuel immediately upon itsissuance from its nozzle, and one or v, more air-passages arranged todischarge cur- 7o rents of air into the fuel as it leaves the nozzle andin the same direction as the firstgientioned air-currents, substantiallyas speci.- ed.

3. The combination, in apulverized-fuel l burner for furnaces, of a neckfitted into an opening in the furnace-wall, a pulverized-fuelsupply-passage having its mouth terminating in said .neck from whichmouth the pulverized fuel is free to eX and, and superposed airpassagesbelow said fuel-supply mouth, sai upper passage supplying air in/lesservolume but with greater force than the lower passage, substantially asspecified.

4. The combination in a pulverized-fuel burner for furnaces, of a neckfitted into an opening in the furnace-wall, a ulverized-fuelsupply-nozzle having its disc arge end tei'.- minating in said neck andfrom which the gulverized fuel is free to expand as it issues om thenozzle, air-passages flanking said nozzle and arranged to dischargeair-currents r into the furnace in proximity to the discharge of thefuel-nozzle so that the currents of air meet the fuel immediately uponits issuance from said nozzle, and one or more air-friassages arrangedto discharge currents o air into'the fuel as it leaves the nozzle and inthe same direction as the first-mentioned air-.currents, substantiallyas specified.

In testimony whereof I have sig-ned my name to this specification in thepresence of two subscribing witnesses.

CHARLES A. Witnesses:

Gao. READER,

I. S.4 ELvEY.

IOO

